Expansion-bolt.



J. KENNEDY.

EXPANSION BOLT. APPLICATION FILED MAY22, 19!].

1,293,465 Patented Feb. 4, 1919.

3 nvewtwa A WM Leeann-.5.

tTNiEU sra 'ras an JOSEPH KENNEDY,. OF NEW YORK, N. Y., ASSIGNOR '10 J. EDWARD OGDEN, OF

MOUNTAINVILLE, NEW YORK.

EXPANSION-BOLT.

To all whom it may concern:

Beit known that I, JOSEPH KENNEDY, a citizen of the United States of America, and a resident of New York, county and State of New York, have invented certain new and useful Improvements in Expansion-Bolts, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

My inventlon relates to new and useful improvements in expansion bolts and its object is to improve upon structures of this kind and to provide a simple device by means of which a more secure anchorage for a bolt in a wall or other structure with which the threads of a bolt cannot engage directly, than have been obtainable by the use of such devices as heretofore have been available. More specifically the invention relates tothat type of anchorage which comprises an 'expansiJble shell with a tapered member movable longitudinally therein by means of which the desired expansion is obtained and its object is to so construct the view of the same tapered member that the pressure produced by the movement thereof to expand the shell is utilized to grip and hold the bolt itself. In ordenthat my-invention may be thoroughlyunderstood I will now proceed to describe the same in the following specification, the section being taken on the line 44 Fig. 5 is a sectional side elevation of the collar shown inFigs. 1 and 2.

Fig. 6 is an end elevation of the same col lar. I

Like characters of reference designate corres onding parts in all the figures.

0 and 11 designate like members which together form a hollow cylindrical shell. Each of these members is provided with lugs Specification of Letters Patent.

outer surface 0 Patented Feb. 4, 1919.

Application filed May 22, 1917. Serial No. 170,11c.

12 which register with and arear'ranged to be bent into depressions 13 in the other memher when the device is assembled to hold the members and the parts therein together. These members are constructed to form between them a cylindrical bore 16 which near the ends is tapered to flare outwardly. The ad acent edges of the members are cut away opposite these tapered portions so that when assembled they form between them diametrlcally opposed slots 14 and 15, the edges of which are preferably undercut as shown in Fig. 3.

Fitted in one of these tapered portions is a collar 20 and in the other an internally threaded nut 30; The collar 20 extends beyond the end of the shell formed by the members and 11. It has a central bore of a diameter large enough to clear the shank of a bolt 40. It also has a pair of oppositely extending lugs 22 which project into the slots but not beyond the periphery of the shell. These lugs are longitudinally shorter than the slots and prevent the collar from moving put of the shell but the longer length of the slots provides for a movementof the collar into the shell. Their sides are preferably undercut "as shown in Fig.6.

The body of the collar is slotted longitudin-ally from the inner end as shown: at 23 for a materlal ipart of its length and the the part of collar which extends outwardly beyond the ends of the slots is provided with less taper than that 'of the tapered part.

The nut is similarly constructed except that instead of a clearance hole for the bolt 1t 1 intern-ally threaded as at 31 to receive the threads 42 of the bolt. Its lugs which extend into-the slots 14 are designated by 32 and its slots by 33.

In operation, a hole is drilled in a wall or otherobject of concrete, brick or other material of such a character that the threads of a bolt cannot make satisfactory engagement therewith. The hole is made deep enough to receive the bolt anchor and of a diameter to form a clearance fit therefor. Now when a bolt is inserted through the collar 20 and into the nut 30, its length is such that either the inside of its head 41 will engage the outer end of the collar, or, as is more often the case, an object to be held by the bolt will come between and be in contact with 'the inside of the head of the bolt and the outer end of the collar. In either case, tightening the bolt will draw the collar 20 and the nut 30 toward each other. During such an operation the lugs 32 will prevent rotation of the nut relative to the shell.

The inner movement of either the collar or of the nut or of both, will force the shell members 10 and 11 apart and into binding engagement with the walls of the hole in which the device has been inserted. This is due to the pressure exerted upon the shell members by reason of their tapered shape. This pressure reacts upon the collar and upon the nut, which on account of the slots therein, will be forced inwardly against the shank of the bolts and upon the threads 42 thereof.

Thus the collar will firmly grip the bolt and hold it solidly in position without any opportunity for lateral vibration which would in time loosen an originally tight anchorage.

Forcing the nut onto the threads of the bolt has a similar effect of firmly gripping the bolt and an added efi'ect of locking the threads so that the bolt will not work out of the nut.

It may be seen that with this device a most effective anchorage may be obtained. It is of course within the scope of my invention to use either a collapsible collar or a collapsible nut. I do not intend to limit myself to the use of both. The invention may be embodied in other structures. than that shown and described, and I intend no limitations other than those imposed by the appended claims.

What I claim is:

1. A transversely expansible shell having a longitudinal bore with flarin portions near the ends thereof, an external y tapered expansion member in the flaring part of the bore near one end of the shell, and an externally tapered nut in the flaring part of the bore near the other end of the shell,

said nut being internally threaded to receive the threads of a bolt, said expansion mem-- ber and nut being constructed and arranged to produce an expandin pressure upon said shell by being opposite y moved longituchi nally therein and to be contracted against in the flaring part of the bore near the other l end of the shell, said nut being threaded to receive the threads of a bolt, said collar and nut being constructed with longitudinal slots and arranged to be moved toward each other within the shell by a bolt to 1 thereby produce an expanding pressure upon said shell and to be contracted against the bolt by said pressure.

3. A plurality of members together forming a longitudinally divided hollow shell having outwardly flaring openings at the ends thereof, said shell being constructed with slots in its walls opposite said flaring portions, an externally vtapered'collar in the flaring part of the shell at one end thereof extending beyond the end of the shell and having a clearance hole for a bolt, a lug projecting from the collar into one of the slots .in the wall of the shell, and an externally tapered nut in-the flaring part of the shell i at the other end thereof, said nut being internally threaded to receive the threads of a bolt, a lug projecting from said nut into another of the slots in the wall of the shell, said'-collar and nut being provided with longitudinal slots and arranged to be moved longitudinally Within the shell toward each other to thereby produce an expanding pressure upon said shell and to be contracted against the bolt by said pressure.

,In witness whereof,-I have hereunto set my hand this 14 day of M y, 1917.

JOSEPH KENNEDY. Witnesses: h

I. B. MOORE, WILLIAM GtDALTo Qf 

